Is there any reason why a shared parenting plan should not work?
I think the "bog standard one-size-fits-all" alternate weekends (which DH isn't even getting) and a few hours mid-week are not good to promote a fullfilling relationship of child with dad.
Some of your posts come across as rather selfish actually - what I detect is that YOU miss the child, how can YOU bear to be away from him, rather than what the child benefits from.
Children benefit and thrive from consistent frequent parenting time with BOTH parents.
You may balk at the child being away from you for a period of time - how does dad feel? Don't you think HE misses his child, that he gets depressed, that he suddenly feels relegated to a 2nd class parent?
The reality now is that the old regime cannot work, in reality, when parents separate they have TWO parents who both love the child dearly and want what's best for him/her, the child also has TWO homes of equal value. Both parents are equal, there isn't suddenly some sort of parental hierarchy.
All the evidence shows that children thrive best when parents work together for the child with consistent frequent parenting by BOTH parents.
My daughter used to have a 1 week on, 1 week off (she's 4 3/4 now) and it worked for us, she was perfectly happy with it, we arranged that every night there was a phone call to the other parent, a simple "night night" phone call, a brief chat.
It had the advantages that both parents got a lot of parenting time, the child had a stable routine, both parents could get involved in all aspects of the childs life - nursery/school etc and my daughter thrived on it. This was until she unilaterally tried to disrupt it and decided to take it through the family court system - she wanted a sole residence order and a defined contact order for me. Well, I object to the terms "contact" and "visiting" as if I am a prisoner or a hospital patient, I am a parent full and equal like mum. Anyway, I applied for a shared residence order which was eventually granted this year, to the benefit of my daughter.
I would suggest trialling a few parenting schedules. It all depends of course on the ex - can he be relied upon to stick to the bargain? Does he actually want to be that involved? The point is, that this so-called "standard" alternate weekends and midweek few hours DOESN'T WORK.
Find out what works for you - maybe 1 week on 1 week off is too much at this time, maybe not. Why not a split weeks situation?
Say:
Week 1: Thur-Sun overnight (i.e. monday drop off at school)
Week 2: Tue+Wed overnight stays.
This sort of system has the advantages of predictability of routine, both parents get involved in the day-to-day routine of the children, the child doesn't learn outdated gender stereotypes (i.e. mum does all the "work", like school run; dad is the "fun" parent who child just sees at the weekend) and the child knows and is secure that he has two parents who equally love him and are involved in his life. What could be better?
Mediation might be a good idea - if you are both equally committed to working things out for the child? Look up national family mediation now and make an initial appointment, make all the appointments and give the dates to the ex, do it.
Have you seen DfES parenting plan?
www.dfes.gov.uk/childrenandfamilies/downloads/ppeng.pdf
believe it from me, you don't really want it to go through the family court system, I know from experience that is stressful, expensive and will probably wreck any future civil discussion between you and your ex as it is basically adverserial litigation with a "winner takes all" attitude. The ONLY winners will be the scumbag solicitors who will make thousands out of your misery.